题目

关于下列过程熵变的判断不正确的是( ) A．溶解少量食盐于水中，ΔS>0 B．纯碳和氧气反应生成CO(g)，ΔS>0 C．H2O(g)变成液态水，ΔS>0 D．CaCO3(s)加热分解为CaO(s)和CO2(g)，ΔS>0 答案：解析：选C。A、B、D选项都是混乱度增大、熵值增大的过程，ΔS>0。C选项是混乱度减小、熵值减小的过程，ΔS<0。I ______ with a classmate of mine because my parents have gone abroad on business. [     ]A. stayed B. am staying C. have stayed D. was staying